在一个Proc 中，如果程序不做处理，则认为状态结束。自动处理下一个状态。

chatSession.go

 	//are we in an existing procedure
 	log.Printf("current procedure = %s", ss.Procedure)
 	proc, found := AllProc[ss.Procedure]
+	processed := false
 	if found {
-		proc.serve(ss, v) //transit to new state
-	} else {
-		processed := ss.serveCommand(v) //menu or txt command e.g. search
+		processed = proc.serve(ss, v) //transit to new state
+		if processed {
+			return
+		}
+		//
+		log.Printf("Auto Switch to next State [%s] ending", ss.Procedure)
+		proc.summary(ss)
+		proc.clean(ss)
+	}
+
+	if !processed {
+		processed = ss.serveCommand(v) //menu or txt command e.g. search
 		log.Printf("current procedure after command = %s", ss.Procedure)
 		if !processed { // transfer to Customer Service (kf)
 			//start transfer

procDummy.go

 	ss.Procedure = ""
 }
 
-func (m *procDummyDef) start(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procDummyDef) start(ss *openIDSessionData, in *InWechatMsg) {
 
 }
 
-func (m *procDummyDef) serve(ss *openIDSessionData, in* InWechatMsg) {
-
+func (m *procDummyDef) serve(ss *openIDSessionData, in *InWechatMsg) (processed bool) {
+	return
 }
 func (m *procDummyDef) summary(ss *openIDSessionData) {
 
 }
 
-func (m *procDummyDef) intro(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procDummyDef) intro(ss *openIDSessionData, in *InWechatMsg) {
 
 }

procEcho.go

 	//log.Println(*ss)
 }
 
-func (m *procEchoDef) start(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procEchoDef) start(ss *openIDSessionData, in *InWechatMsg) {
 	ss.setKvPair("started at", time.Now().Format("2006/03:04:05"))
 }
 
-func (m *procEchoDef) serve(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procEchoDef) serve(ss *openIDSessionData, in *InWechatMsg) (processed bool) {
 	stopEcho := false
 	if in.header.MsgType == "text" {
 		if in.body.(TextMsg).Content == "结束Echo" || in.body.(TextMsg).Content == "结束echo" {
 		ss.refreshExpire(600)
 		procEcho.doCommand(ss, in)
 	}
-
+	processed = true
+	return
 }
 
 func (m *procEchoDef) summary(ss *openIDSessionData) {
 	kfSendTxt(ss.OpenID, msg)
 }
 
-func (m *procEchoDef) intro(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procEchoDef) intro(ss *openIDSessionData, in *InWechatMsg) {
 	in.replyText("请输入不同类型的微信信息，比如文字，图片，视频，地址，链接，我们将原样回应您")
 	kfSendTxt(ss.OpenID, "10分钟静默之后 Echo将自动结束，\n输入 [结束Echo],或者语音 ‘退出退出', 清除Echo模式")
 }
 
-func (m *procEchoDef) doCommand(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procEchoDef) doCommand(ss *openIDSessionData, in *InWechatMsg) {
 	openID := in.header.FromUserName
 	str, err := BuildTextMsg(openID, "default")
 	log.Println("echoCommand :" + in.header.MsgType)
 	return
 }
 
-func (m *procEchoDef) doEvents(ss *openIDSessionData, in* InWechatMsg) {
+func (m *procEchoDef) doEvents(ss *openIDSessionData, in *InWechatMsg) {
 	openID := in.header.FromUserName
 	str := ""
 	e := in.body.(EventMsg)

procGetBasicUserInfo.go

 	procGetBasicUserInfo.clean(ss)
 }
 
-func (m *getBasicUserInfoDef) serve(ss *openIDSessionData, in *InWechatMsg) {
-
+func (m *getBasicUserInfoDef) serve(ss *openIDSessionData, in *InWechatMsg) (processed bool) {
+	return false
 }
 func (m *getBasicUserInfoDef) summary(ss *openIDSessionData) {
 	//build article message with user's picture and email,phone

procSearchMember.go

 
 }
 
-func (m *procSearchMemberDef) serve(ss *openIDSessionData, in *InWechatMsg) {
+func (m *procSearchMemberDef) serve(ss *openIDSessionData, in *InWechatMsg) (processed bool) {
 	switch msg := in.body.(type) {
 	case TextMsg:
 		if m.endingCommand(ss, msg.Content) {
 		str, _ := BuildTextMsg(ss.OpenID, "搜索 "+msg.Content+"... ...")
 		in.replyXML(str)
 		m.displayUserInfo(ss, msg.Content)
+		processed = true
 	case PicMsg:
 		//str := buildPicMsg(ss.OpenID, msg.MediaId)
 		xml, _ := BuildKFTransferAnyOneMsg(ss.OpenID)
 		in.replyXML(xml)
 		kfSendPicByMediaID(ss.OpenID, msg.MediaId)
 		kfSendTxt(ss.OpenID, "已转接校友会理事会，稍后答复您")
+		processed = true
 	case VoiceMsg:
 		name := strings.TrimSuffix(msg.Recognition, "。")
 		str, _ := BuildTextMsg(ss.OpenID, "搜索 "+name+"... ...")
 		in.replyXML(str)
 		m.displayUserInfo(ss, name)
+		processed = true
 	case EventMsg:
 		if msg.Event == "LOCATION" {
 			onLocation(in)
+			processed = true
 		}
 	default:
 		str := fmt.Sprintf("搜索功能结束")
 		kfSendTxtAs(ss.OpenID, str, "孙鹏")
-		m.clean(ss)
+		processed = false
 	}
+	return
 }
 func (m *procSearchMemberDef) summary(ss *openIDSessionData) {
 

procedure.go

 	init(*openIDSessionData)  //house keeping
 	clean(*openIDSessionData) //house keeping
 
-	start(*openIDSessionData, *InWechatMsg) //for first message
-	serve(*openIDSessionData, *InWechatMsg) //for all subsequent message
-	summary(*openIDSessionData)             //after all message has been done
-	intro(*openIDSessionData, *InWechatMsg) //initial text/video/voice introduction
+	start(*openIDSessionData, *InWechatMsg)      //for first message
+	serve(*openIDSessionData, *InWechatMsg) bool //for all subsequent message
+	summary(*openIDSessionData)                  //after all message has been done
+	intro(*openIDSessionData, *InWechatMsg)      //initial text/video/voice introduction
 }
 
 //AllProc all procedure that we implemented